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What kind of stain is this? Ac drip pan leaked on building

Anyone know what this is and how to clean it?Pm said the stain was due to a faulty roof ac catch pan. Said the pan was tiled incorrectly and spilled this gunk over. Seems gooey / sticky to the touch and gummy like tar

Faulty roof AC pan would tell me possibly Mold or Mildew. That thick stuff looks like some sort of animal feces with a bad stomach virus.. I'd give tony Shelton a call and ask him since he does a lot roof top HVAC work.